Zhou Yufeng, Yu Yanxia, Zhang Yaqian, Liu Xiaodong, Yang Haisheng, Liang Xiaojuan, Xia Wei, Xiang Weidong
College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China.
Inorg Chem. 2021 Mar 15;60(6):3814-3822. doi: 10.1021/acs.inorgchem.0c03573. Epub 2021 Feb 11.
All-inorganic halide perovskite (CsPbBr) nanocrystals (NCs) have received widespread attention owing to their unique photoelectric properties. This work reports a novel strategy to control the phase transition from CsPbBr to CsPbBr and investigates the effects of different treatment times and treatment temperatures on perovskite NCs formation. By controlling the volume of tetraethoxysilane (TEOS) added, the formation of different phases of perovskite powder can be well controlled. In addition, a white light-emitting diode (WLED) device is designed by coupling the CsPbBr/CsPbBr-CsPbBr NCs@TEOS nanocomposite and CaAlSiN:Eu commercial phosphor with a 460 nm InGaN blue chip, exhibiting a high luminous efficiency of 57.65 lm/W, color rendering index (CRI) of 91, and a low CCT of 5334 K. The CIE chromaticity coordinates are (0.3363, 0.3419). This work provides a new strategy for the synthesis of CsPbBr/CsPbBr-CsPbBr NCs@TEOS nanocomposite, which can be applied to the field of WLEDs and display devices.
全无机卤化物钙钛矿（CsPbBr）纳米晶体（NCs）因其独特的光电特性而受到广泛关注。本工作报道了一种控制从CsPbBr到CsPbBr相变的新策略，并研究了不同处理时间和处理温度对钙钛矿NCs形成的影响。通过控制四乙氧基硅烷（TEOS）的添加量，可以很好地控制钙钛矿粉末不同相的形成。此外，通过将CsPbBr/CsPbBr-CsPbBr NCs@TEOS纳米复合材料与CaAlSiN:Eu商用荧光粉与460 nm InGaN蓝色芯片耦合，设计了一种白光发光二极管（WLED）器件，其发光效率高达57.65 lm/W，显色指数（CRI）为91，相关色温（CCT）低至5334 K。CIE色度坐标为（0.3363，0.3419）。本工作为CsPbBr/CsPbBr-CsPbBr NCs@TEOS纳米复合材料的合成提供了一种新策略，可应用于WLED和显示器件领域。
